I believe that we will be seeing the death of "assume good faith", which is not a bad thing, given that this was an exploit vector that has been actively abused for many years now.
"Assume bad faith and work backwards from that, rule out any possible exploits and only then clear the input for processing" will be the new normal.
Which is good. We need friction. Friction makes stuff slow down and work at the speed of humans.
Quite the opposite. You just add a Wall with a Gate. Inside those walls, you suddenly have a high trust society again.
The issue that is currently breaking reality was that we thought that everywhere could be a "high trust" space. This was proven countless times to be wrong.
Tearing down all walls - as it happened with the assault on friction (thanks hyperscaling) - did not lead to the "high trust" spilling out, but the "low trust" spilling in, essentially.
Plus that even with such a small scale of the "inside", the thing fails gracefully. It is arguably a failure mode, yes, but it is one that leaves a functioning system (albeit one that stays below its potential).
This is not true for the inversion of the scenario. That does _not_ fail safe but just leaves rubble behind.